<template>
    <el-menu 
      default-active="1-4-1" 
      class="el-menu-vertical-demo" 
      @open="handleOpen" 
      @close="handleClose" 
      :collapse="isCollapse"
      background-color="#545c64"
      text-color="#fff"
      active-text-color="#ffd04b"
      >
      <h3>{{isCollapse ? '管理系统':'项目管理系统'}}</h3>
        <el-menu-item @click="clickMenu(item)" v-for="item in noChilderen"  :key="item.name" :index="item.name">
          <!-- `el-icon-${item.icon}`:模板字符串的拼接 -->
          <i :class="`el-icon-${item.icon}`"></i>
          <span slot="title">{{ item.label }}</span>
        </el-menu-item>
      <el-submenu v-for="item in hasChilderen" :key="item.label" :index="item.label">
        <template slot="title">
          <i :class="`el-icon-${item.icon}`"></i>
          <span slot="title">{{item.label}}</span>
        </template>
        <el-menu-item-group v-for="subItem in item.children" :key="subItem.path">
          <el-menu-item @click="clickMenu(subItem)" :index="subItem.path">{{subItem.label}}</el-menu-item>
        </el-menu-item-group>
      </el-submenu>
    </el-menu>
</template>

<style lang="less" scoped>
  .el-menu-vertical-demo:not(.el-menu--collapse){
    width: 200px;
    min-height: 400px;
  }
  .el-submenu .el-menu-item {
    // 解决二级标题突出问题
    min-width: 0px; 
}
  .el-menu{
    border-right: none;
    height: 100vh;
    h3{
       color:#fff;
       text-align: center;
       line-height: 48px;
       font-size: 16px;
       font-weight: 400px;
    }
  }
</style>

<script>
import Cookie from 'js-cookie'
  export default {
    data() {
      return {
      };
    },
    computed:{
      // 没有子菜单
      noChilderen(){
        return this.menuData.filter(item => !item.children)
      },
      // 有子菜单
      hasChilderen(){
        return this.menuData.filter(item => item.children)
      },
      // vuex组件间通信必须定义在computed中
      isCollapse(){
        // 读取tab下的isCollapse的值
        return this.$store.state.tab.isCollapse
      },
      menuData(){
        // 判断当前数据，如果缓存中没有，当前store中去获取
        return JSON.parse(Cookie.get('menu')) || this.$store.state.tab.menu
      }
    },
    methods: {
      handleOpen(key, keyPath) {
        console.log(key, keyPath);
      },
      handleClose(key, keyPath) {
        console.log(key, keyPath);
      },
      clickMenu(item){
        var token =  Cookie.get("token");
        if(token === null){
          this.$router.push("/")
        }else{
          // 当页面的路由与跳转的路由不一致才允许跳转，$route：当前页面的路由
          if(this.$route.path !==item.path && !(this.$route.path === '/layout/home' && (item.path==='/layout'))){
            console.log(item.path)
            // 页面跳转,$router：表示整个router实例
            this.$router.push(item.path)
          }
        }
        this.$store.commit('selectMenu',item);
      }
    }
  }
</script>



